When selecting the quality of capacitors used in a crossover, I would assume that the most critical capacitor would be the capacitor in series for the tweeters highpass. I assume that the capacitors in parallel for the woofers section or any traps, etc are less critical.

I have used Solen capacitors throughout my design and am curious what kind of effect I will see from upgrading to something like Hovland or Infinicap and where in the circuit will I get the most bang for the buck.